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Penjelasan dengan langkah-langkah:

—Nomor 1

a = 1/25

r = (1/5)/(1/25) = 5

U9 = a x r^(n-1)

U9 = 1/25 x 5^(9-1)

U9 = 1/5^2 x 5^8

U9 = 5^6

U9 = 15.625

—Nomor 2

Pola bil ganjil = 2n – 1

a/U1 = 2.1 – 1 = 1

b = 2

S16 = n/2 x (a + U16)

S16 = 16/2 x (1 + (2.16 – 1))

S16 = 8 x (1 + 32 – 1)

S16 = 8 x 32

S16 = 256